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sunrast: Add support for negative linesize. 

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Aneesh Dogra 2012-03-23 23:24:00 +05:30 committed by Justin Ruggles
parent 14ba7472dc
commit cc965300cb
1 changed files with 7 additions and 4 deletions
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11
libavcodec/sunrastenc.c
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@ -83,15 +83,18 @@ static void sunrast_image_write_image(AVCodecContext *avctx,
if (s->type == RT_BYTE_ENCODED) {
uint8_t value, value2;
int run;
const uint8_t *end = pixels + avctx->height * linesize;
const uint8_t *start = linesize < 0 ? pixels + (avctx->height - 1) * linesize
: pixels;
const uint8_t *end = linesize < 0 ? pixels - linesize
: pixels + avctx->height * linesize;
ptr = pixels;
#define GET_VALUE ptr >= end ? 0 : x >= len ? ptr[len-1] : ptr[x]
#define GET_VALUE ptr >= end || ptr < start ? 0 : x >= len ? ptr[len-1] : ptr[x]
x = 0;
value2 = GET_VALUE;
while (ptr < end) {
while (ptr < end && ptr >= start) {
run = 1;
value = value2;
x++;
@ -101,7 +104,7 @@ static void sunrast_image_write_image(AVCodecContext *avctx,
}
value2 = GET_VALUE;
while (value2 == value && run < 256 && ptr < end) {
while (value2 == value && run < 256 && ptr < end && ptr >= start) {
x++;
run++;
if (x >= alen) {